These Add-A-Drawer bins were very popular at pretty much every company that I worked at over the last 40 ish years. It looks like they don’t make them anymore so I have been searching for some used ones or a source for something similar that is available.
What makes these really handy is that each bin shell interlocks with the others, so you can make any sized array and simply add a column or row as needed, or make odd shapes for example I have used these along the wall in a closet under a stair case so the bins follow the contour of the stringers.
There was a decent supply of these at a surplus shop in Toronto, however the last time I inquired about purchasing a small batch, the owner stated someone came in a purchased every last one, he did have a few of the larger 4” bins however I was looking for the smaller 2” x 2.5” bins.
So does anyone have a source?